The 20-year-old California woman, who filed a paternity lawsuit against Justin Bieber, is still adamant that the teen popstar is the father of her 5-month-old son.

The 20-year-old California woman, who filed a paternity lawsuit against Justin Bieber, is still adamant that the teen popstar is the father of her 5-month-old son.

According to the Chicago Sun-Times, Mariah Yeater denied ex-boyfriend Robbie Powell as being the real father, saying that she does know him but he was not the child’s dad. “He is not the father, and he’s locked up and out of the picture,” Radar Online quoted Yeater as telling the publication.

Yeater told the paper that she is still pursuing her paternity claim against Bieber out of court, through her attorneys in Chicago and Los Angeles."I dropped my lawsuit, but never my claim."

“I still definitely want a DNA test and I want to refile my paternity case -- I do believe he is the father,” Yeater said.

While Bieber claims he took a DNA test last month, Yeater’s Chicago counsel, Jeffery Leving, said that the singer’s camp has been sluggish and non-cooperative in getting on the same page as Yeater’s, concerning the test.

“Bieber’s counsel hasn’t told me where Bieber’s alleged DNA is secured, nor has provided information substantiating the chain of custody and protocol utilized in the claimed DNA collection and testing,” Leving said. “If negotiations with Bieber’s counsel does not result in DNA testing of everyone under mutually agreeable and controlled conditions, then the legal proceedings will likely need to be refilled,” he added.